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Diffstat (limited to 'libguile/whippet/benchmarks/ephemerons.c')
-rw-r--r-- | libguile/whippet/benchmarks/ephemerons.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/libguile/whippet/benchmarks/ephemerons.c b/libguile/whippet/benchmarks/ephemerons.c new file mode 100644 index 000000000..2262bd5c9 --- /dev/null +++ b/libguile/whippet/benchmarks/ephemerons.c @@ -0,0 +1,272 @@ +#include <errno.h> +#include <pthread.h> +#include <stdio.h> +#include <stddef.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "assert.h" +#include "gc-api.h" +#include "gc-basic-stats.h" +#include "gc-ephemeron.h" +#include "simple-roots-api.h" +#include "ephemerons-types.h" +#include "simple-allocator.h" + +typedef HANDLE_TO(SmallObject) SmallObjectHandle; +typedef HANDLE_TO(struct gc_ephemeron) EphemeronHandle; +typedef HANDLE_TO(Box) BoxHandle; + +static SmallObject* allocate_small_object(struct gc_mutator *mut) { + return gc_allocate_with_kind(mut, ALLOC_KIND_SMALL_OBJECT, sizeof(SmallObject)); +} + +static Box* allocate_box(struct gc_mutator *mut) { + return gc_allocate_with_kind(mut, ALLOC_KIND_BOX, sizeof(Box)); +} + +static struct gc_ephemeron* allocate_ephemeron(struct gc_mutator *mut) { + struct gc_ephemeron *ret = gc_allocate_ephemeron(mut); + *tag_word(gc_ref_from_heap_object(ret)) = tag_live(ALLOC_KIND_EPHEMERON); + return ret; +} + +/* Get the current time in microseconds */ +static unsigned long current_time(void) +{ + struct timeval t; + if (gettimeofday(&t, NULL) == -1) + return 0; + return t.tv_sec * 1000 * 1000 + t.tv_usec; +} + +struct thread { + struct gc_mutator *mut; + struct gc_mutator_roots roots; +}; + +static void print_elapsed(const char *what, unsigned long start) { + unsigned long end = current_time(); + unsigned long msec = (end - start) / 1000; + unsigned long usec = (end - start) % 1000; + printf("Completed %s in %lu.%.3lu msec\n", what, msec, usec); +} + +struct call_with_gc_data { + void* (*f)(struct thread *); + struct gc_heap *heap; +}; +static void* call_with_gc_inner(struct gc_stack_addr *addr, void *arg) { + struct call_with_gc_data *data = arg; + struct gc_mutator *mut = gc_init_for_thread(addr, data->heap); + struct thread t = { mut, }; + gc_mutator_set_roots(mut, &t.roots); + void *ret = data->f(&t); + gc_finish_for_thread(mut); + return ret; +} +static void* call_with_gc(void* (*f)(struct thread *), + struct gc_heap *heap) { + struct call_with_gc_data data = { f, heap }; + return gc_call_with_stack_addr(call_with_gc_inner, &data); +} + +#define CHECK(x) \ + do { \ + if (!(x)) { \ + fprintf(stderr, "%s:%d: check failed: %s\n", __FILE__, __LINE__, #x); \ + exit(1); \ + } \ + } while (0) + +#define CHECK_EQ(x, y) CHECK((x) == (y)) +#define CHECK_NE(x, y) CHECK((x) != (y)) +#define CHECK_NULL(x) CHECK_EQ(x, NULL) +#define CHECK_NOT_NULL(x) CHECK_NE(x, NULL) + +static size_t ephemeron_chain_length(struct gc_ephemeron **loc, + SmallObject *key) { + struct gc_ephemeron *head = gc_ephemeron_chain_head(loc); + size_t len = 0; + while (head) { + CHECK_EQ(key, (SmallObject*)gc_ref_value(gc_ephemeron_key(head))); + Box *value = gc_ref_heap_object(gc_ephemeron_value(head)); + CHECK_NOT_NULL(value); + key = value->obj; + CHECK_NOT_NULL(key); + head = gc_ephemeron_chain_next(head); + len++; + } + return len; +} + +static double heap_size; +static double heap_multiplier; +static size_t nthreads; + +static void cause_gc(struct gc_mutator *mut) { + // Doing a full collection lets us reason precisely about liveness. + gc_collect(mut, GC_COLLECTION_MAJOR); +} + +static void make_ephemeron_chain(struct thread *t, EphemeronHandle *head, + SmallObjectHandle *head_key, size_t length) { + BoxHandle tail_box = { NULL }; + PUSH_HANDLE(t, tail_box); + + CHECK_NULL(HANDLE_REF(*head_key)); + HANDLE_SET(*head_key, allocate_small_object(t->mut)); + + for (size_t i = 0; i < length; i++) { + HANDLE_SET(tail_box, allocate_box(t->mut)); + HANDLE_REF(tail_box)->obj = HANDLE_REF(*head_key); + HANDLE_SET(*head_key, allocate_small_object(t->mut)); + struct gc_ephemeron *ephemeron = allocate_ephemeron(t->mut); + gc_ephemeron_init(t->mut, ephemeron, + gc_ref_from_heap_object(HANDLE_REF(*head_key)), + gc_ref_from_heap_object(HANDLE_REF(tail_box))); + gc_ephemeron_chain_push(HANDLE_LOC(*head), ephemeron); + } + + POP_HANDLE(t); +} + +static void* run_one_test(struct thread *t) { + size_t unit_size = gc_ephemeron_size() + sizeof(Box); + size_t list_length = heap_size / nthreads / heap_multiplier / unit_size; + + printf("Allocating ephemeron list %zu nodes long. Total size %.3fGB.\n", + list_length, list_length * unit_size / 1e9); + + unsigned long thread_start = current_time(); + + SmallObjectHandle head_key = { NULL }; + EphemeronHandle head = { NULL }; + + PUSH_HANDLE(t, head_key); + PUSH_HANDLE(t, head); + + make_ephemeron_chain(t, &head, &head_key, list_length); + + size_t measured_length = ephemeron_chain_length(HANDLE_LOC(head), + HANDLE_REF(head_key)); + CHECK_EQ(measured_length, list_length); + + cause_gc(t->mut); + measured_length = ephemeron_chain_length(HANDLE_LOC(head), + HANDLE_REF(head_key)); + CHECK_EQ(measured_length, list_length); + + if (!GC_CONSERVATIVE_ROOTS) { + HANDLE_SET(head_key, NULL); + cause_gc(t->mut); + measured_length = ephemeron_chain_length(HANDLE_LOC(head), + HANDLE_REF(head_key)); + CHECK_EQ(measured_length, 0); + } + + // swap head_key for a key halfway in, cause gc + // check length is expected half-length; warn, or error if precise + // clear and return + + print_elapsed("thread", thread_start); + + POP_HANDLE(t); + POP_HANDLE(t); + + return NULL; +} + +static void* run_one_test_in_thread(void *arg) { + struct gc_heap *heap = arg; + return call_with_gc(run_one_test, heap); +} + +struct join_data { int status; pthread_t thread; }; +static void *join_thread(void *data) { + struct join_data *join_data = data; + void *ret; + join_data->status = pthread_join(join_data->thread, &ret); + return ret; +} + +#define MAX_THREAD_COUNT 256 + +int main(int argc, char *argv[]) { + if (argc < 4 || 5 < argc) { + fprintf(stderr, "usage: %s HEAP_SIZE MULTIPLIER NTHREADS [GC-OPTIONS]\n", argv[0]); + return 1; + } + + heap_size = atof(argv[1]); + heap_multiplier = atof(argv[2]); + nthreads = atol(argv[3]); + + if (heap_size < 8192) { + fprintf(stderr, + "Heap size should probably be at least 8192, right? '%s'\n", + argv[1]); + return 1; + } + if (!(1.0 < heap_multiplier && heap_multiplier < 100)) { + fprintf(stderr, "Failed to parse heap multiplier '%s'\n", argv[2]); + return 1; + } + if (nthreads < 1 || nthreads > MAX_THREAD_COUNT) { + fprintf(stderr, "Expected integer between 1 and %d for thread count, got '%s'\n", + (int)MAX_THREAD_COUNT, argv[2]); + return 1; + } + + printf("Allocating heap of %.3fGB (%.2f multiplier of live data).\n", + heap_size / 1e9, heap_multiplier); + + struct gc_options *options = gc_allocate_options(); + gc_options_set_int(options, GC_OPTION_HEAP_SIZE_POLICY, GC_HEAP_SIZE_FIXED); + gc_options_set_size(options, GC_OPTION_HEAP_SIZE, heap_size); + if (argc == 5) { + if (!gc_options_parse_and_set_many(options, argv[4])) { + fprintf(stderr, "Failed to set GC options: '%s'\n", argv[4]); + return 1; + } + } + + struct gc_heap *heap; + struct gc_mutator *mut; + struct gc_basic_stats stats; + if (!gc_init(options, NULL, &heap, &mut, GC_BASIC_STATS, &stats)) { + fprintf(stderr, "Failed to initialize GC with heap size %zu bytes\n", + (size_t)heap_size); + return 1; + } + struct thread main_thread = { mut, }; + gc_mutator_set_roots(mut, &main_thread.roots); + + pthread_t threads[MAX_THREAD_COUNT]; + // Run one of the threads in the main thread. + for (size_t i = 1; i < nthreads; i++) { + int status = pthread_create(&threads[i], NULL, run_one_test_in_thread, heap); + if (status) { + errno = status; + perror("Failed to create thread"); + return 1; + } + } + run_one_test(&main_thread); + for (size_t i = 1; i < nthreads; i++) { + struct join_data data = { 0, threads[i] }; + gc_call_without_gc(mut, join_thread, &data); + if (data.status) { + errno = data.status; + perror("Failed to join thread"); + return 1; + } + } + + gc_basic_stats_finish(&stats); + fputs("\n", stdout); + gc_basic_stats_print(&stats, stdout); + + return 0; +} + |